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Alkylation catalyst containing modified zsm-11 zeolite and its application

A ZSM-11 catalyst technology, applied in the field of shape-selective alkylation catalysts, can solve the problems of low conversion rate of toluene, side reactions of disproportionation reaction and isomerization reaction, low selectivity of methyl ethyl benzene, etc. Effects of side reactions such as transalkylation, increased selectivity, and reduced operational difficulty and energy consumption

Active Publication Date: 2014-10-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the invention provides a catalyst containing modified ZSM-11 zeolite and its application in the synthesis of p-methylethylbenzene from toluene and ethylene, which solves the problem that the toluene conversion rate in the prior art is not high, The selectivity of p-methylethylbenzene is low, the side reactions such as disproportionation reaction and isomerization reaction are serious, so as to improve the effect of toluene alkylation reaction

Method used

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preparation example Construction

[0015] The preparation process of catalyst of the present invention mainly comprises the following steps:

[0016] (1) loading the rare earth metal compound on the ZSM-11 zeolite, drying and roasting to obtain the ZSM-11 zeolite modified by the rare earth metal oxide;

[0017] (2) impregnating the rare earth metal oxide modified ZSM-11 zeolite prepared in step (1) with a solution containing a modified silicon compound, drying and roasting to obtain a silicon-rare earth modified ZSM-11 zeolite;

[0018] (3) The modified ZSM-11 zeolite, binder, basic compound, extrusion aid and water prepared in step (2) are fully kneaded into a plastic paste, extruded, dried and roasted to obtain the present invention catalyst.

[0019] In step (1), the rare earth metal compound can be loaded on the molecular sieve by ion exchange method, impregnation method or kneading method, wherein when the ion exchange method or impregnation method is used, the rare earth compound used to prepare the solu...

Embodiment 1

[0027] 【Example 1】 (If there is no special note below, the percentages are percentages by weight)

[0028] The preparation steps of a kind of catalyst of the present invention are as follows:

[0029] (1) Take 300 grams of ZSM-11 zeolite with a silicon-aluminum ratio (silica / alumina molar ratio, the same below) of 80, and prepare 450 milliliters of lanthanum nitrate solution with a content of 50 grams as lanthanum oxide. The above solution containing lanthanum nitrate and ZSM-11 zeolite were thoroughly mixed, dried at 110°C and calcined at 500°C for 4 hours, and the composition of the obtained sample was: lanthanum oxide / ZSM-11=1 / 6.

[0030](2) Use the lanthanum oxide-modified ZSM-11 (350 grams) prepared in (1) step, and then use the prepared n-hexane solution of polyphenylmethylsiloxane with a content of 25 grams in terms of silicon dioxide 500 ml was impregnated, and left to stand after impregnated until the solvent was completely evaporated, dried and then roasted at 550°...

Embodiment 2

[0033] The preparation method of a kind of catalyst of the present invention is the same as embodiment 1, and the difference is that the silicon-alumina ratio of the ZSM-11 zeolite used is 38, and the composition of the catalyst obtained is: Na 2 O: 1.5%, SiO 2 :5%, La 2 o 3 : 10%, ZSM-11: 60%, binding agent: 23.5%, numbering is E-2, its reaction result in the selective alkylation of toluene and ethylene is shown in Table 1.

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Abstract

The invention discloses an alkylation catalyst containing modified ZSM-11 zeolite and its application. In terms of weight percentage of the catalyst, it has the following composition: ZSM-11 zeolite 30%~85%, binder 10%~60%, alkali metal oxide 0.1%~10%, ZSM-11 zeolite modification additive silica 1 %~20%, ZSM-11 zeolite modification additive rare earth metal oxide 0.5%~30%. The catalyst of the invention is applied in the toluene alkylation process for synthesizing p-methylethylbenzene from toluene and ethylene, and has good catalytic reaction effect.

Description

technical field [0001] The invention relates to an alkylation catalyst containing modified ZSM-11 zeolite and its application, in particular to a shape-selective alkylation catalyst for synthesizing p-methylethylbenzene from toluene and ethylene. Background technique [0002] Dehydrogenation of p-methylethylbenzene can produce p-methylstyrene, which can be polymerized to produce a new type of plastic, polymethylstyrene. The polymer is superior to existing polystyrene plastics in terms of specific gravity, heat resistance, transparency and shrinkage. In addition, p-methylstyrene can be copolymerized with other monomers, which can improve the heat resistance and flame retardancy of some polymers, and can be widely used in the manufacture of engineering plastics, alkyd resin coatings, etc., so it has been widely valued. For a long time, there is no satisfactory method for obtaining high-concentration p-methylethylbenzene. To obtain para-position products, there must be a shape...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C15/02C07C2/66
CPCY02P20/52
Inventor 徐会青刘全杰贾立明王伟
Owner CHINA PETROLEUM & CHEM CORP
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